Azo dystuffs



Patented Nov. 29, 1923.

CARL HEIDENREICHOF LEVERKUSEN, NEAR COLOGNE-ONTHE-BHINE; GERMANY,

ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER AND C0,, OF LEVERKUSEN,

NFZA'R. COLOGNE-ON-THE-RHINE, GERMANY.

AZO DYSTUFFS.

No Drawing.

(X mezining H and CH The new dyestufi's'can-be obtained by 001 biningthe diazocornpounds of 'para-phenyh ene dian1in-2.6-disulfonic acid witha phenol-ortho-carboxylic acid e. g. salicylic and cresotinic acid.

They are after being dried and pulverized in the shape of theirsodium'salts from greyish i yellow to violet powders which are soluble;in water generally with'a yellowish coloraltiona The canbe printed oncotton tophenylene-dia-1nin-26-disulfonic 'geth-er with c romiumacetate, pure greenish-=yelloi 7j shades fast to soap and chlorin being,thus obtained. Together with methyl ene hluevthey furnish valuable greenpigments Fast to light; Upon treatment with tin and hydrochloric acidthe dyes are split up into paro-phenylenodiamin-2.6-disultonic acid anda paroaminoplienolcarboxylic acid shell as paj'rzi-aminosalicylic acidor pal-maminbicresotinic acid.

In order to illustrate the new process more fully the following exampleis given, the parts being by weight. I

29 parts of the monosodium salt of'paraacid are dissolved in 120 partsof water, 15 parts of a 30'per cent hydrochloric acid are added and theresulting, solution is cooled to 10 C. Subsequently it solution of 6.9parts of sodi' uni nitrite in 50 parts of Water is added and then asolution of 14 parts of salicylic acid in 100 parts of water and thenecessary 7 amount of caustic soda lye. The mixture is cooled with icedown to zero and a 10 per cent solution of 10 parts of sodium hydroxidis added in the course of one hour to the so- Application filed April1*), 1922. Serial No. 553,984.

lution which has to be stirred. Stirring iscontinued for several hoursand the mixture is ucldulntcd with hydrochloric acid. The

coloring ina-ltcr separates. It is filtered oil".

and dried.

According to the quantity of tree hydrochloric acid the dye contains itis after being dried and pulverized .1 yellow to dark violet powdersoluble in water with a yellowish coloration. It has in a free stateprobably the following formula:

soon i I Upon treatment with tin and hydrochloric acid it is split upinto para-phenylenodi'amin-2 .6 -disulfonic acid andpara-amino-salicylic acid. It dyes-chromed cotton yellow shades. i

I claim:

1., The hereindescribed new azodyestufi's derived from diazotizedparo-phenylene-diamin-2.6-disultonic acid and a phenol-orthocarboxylicacid which-dyes have most prob ably the following formula:

SOQH

SO H (X meaningrH and OIL).

which are after being dried and pulverized. greyish-yellow to violetpowders soluble water with a yellowish coloration; dyein chromed cottonpure greenish-yellow shades fast to'soap and to chlorin; yielding uponiii-2.6disultonio acid and salicylic acid having in a free state mostprobably the formula: i a

SOaH

COOH

SOIH

acid

2 meme? yellow to dark violet powder soluble; in In testimony whereof Ihave hereunto set Water with a yellowish coloration; yiel ing my hand inthe presence of two subscrib ng upon reduction with tin and hydrochloricwitnesses.

, acid para-phenylenediamin-2.6-disulfonio CARL HEIDENREICH. acid andpara-salicylic acid; dyeing chromed Witnesses:

cotton yellow shades fast to soap and to HEINY W. HAAR, chlorinsubstantially as described. ALBERTINE PORGER.

